| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.04 |
| Score | 0% | 61% |
The Sun is a __________-type main-sequence star.
S |
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G |
|
D |
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E |
The Sun is a G-type main-sequence star (G2V) but is informally known as a yellow dwarf star. Composed of 73% hydrogen and 25% helium, the hot plasma that makes up the Sun reaches 9,900°F (5,505°C) at the surface. It formed approximately 4.6 billion years ago and makes up 99.86% of the mass in the solar system.
In cell biology, where does DNA replication take place?
cytoplasm |
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Golgi apparatus |
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mitochondria |
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nucleus |
The cell nucleus contains the genetic material of the cell and is where DNA replication takes place.
When the clouds become too saturated with water, the water is released as precipitation in the form of:
ice |
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snow |
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snow or ice |
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rain |
Rising into the atmosphere, the water condenses into clouds. When the clouds become too saturated with water, the water is released as snow or ice precipitation which may warm as it falls to reach Earth as rain.
In the food chain, bacteria and fungi convert the organic matter in the dead bodies of plants and animals into simple nutrients. Bacteria and fungi are:
producers |
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primary consumers |
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decomposers |
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scavengers |
Decomposers (saprotrophs) are organisms such as bacteria and fungi that break down the organic matter in the dead bodies of plants and animals into simple nutrients.
Respiration is the process by which __________ absorb oxygen and eliminate carbon dioxide.
diaphragms |
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bronchioles |
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capillaries |
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blood cells |
The respiratory system manages respiration which is the process by which blood cells absorb oxygen and eliminate carbon dioxide.